I haven't used the Chris Carmichael tapes. I'd pop one and give it a try. Why spend money if you like them.
I do quite like the Spinervals tapes. We have several. We didn't buy them in order, we got what suited our work out needs. I find them quite motivating, but I know when it's come up before there have been folks who aren't as thrilled. You might do a search on the forum using Spinervals as your key word to see what others think.
V.



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